<template>
    <div>
      <!-- 搜索栏 ： 两个搜索框  搜索按钮  添加餐品按钮  批量删除   -->
      <el-row>
        <el-col :span="2"></el-col>
        <el-col :span="5">
             <el-input placeholder="请输入名称搜索" v-model="query.foodName"/>
        </el-col>
        <el-col :span="2">
                <el-button type="primary" plain @click="getByPage">搜索</el-button>
        </el-col>
        <el-col :span="3">
                <el-button type="success" plain @click="showDialog">新增餐品</el-button>
        </el-col>
        <el-col :span="3">
                <el-button type="danger" plain @click="handleBatchDel">批量删除</el-button>
        </el-col>
        
      </el-row>
      <!-- 表格 -->
      <el-row>
        <el-col :span="2"></el-col>
        <el-col :span="20">
            
          <el-table :data="pb.data" 
                    stripe border
                    @selection-change="handleSelectionChange">
            <!-- 表格中的选中列 -->
            <el-table-column type="selection"  width="55" />
            <el-table-column prop="foodName" label="餐品名称" />
            <el-table-column prop="foodExplain" label="餐品简介" />
            <el-table-column label="餐品价格">
                <template #default="scope">
				  ￥ {{scope.row.foodPrice}}
			  </template>
            </el-table-column>
            <el-table-column prop="business.businessName" label="所属商家" />
            <el-table-column label="主图">
                <template #default="scope">
                    <el-image style="width: 50px;" :src="scope.row.foodImg" fit="contain" />
			    </template>
            </el-table-column>
            <el-table-column prop="remarks" label="备注" />
            <el-table-column label="操作" width="200px">
                  <template #default="scope">
                    <el-button size="small" @click="handleEdit(scope.row.foodId)">
                     编辑
                    </el-button>
                    <el-button
                      size="small"
                      type="danger"
                      @click="handleDelete(scope.row.foodId)"
                    >
                      删除
                    </el-button>
                  </template>
                </el-table-column>
          </el-table>
            
        </el-col>
        
      </el-row>  
      <!-- 分页组件 -->
      <el-row>
        <el-col :span="6"></el-col>
        <el-col :span="12">
             <el-pagination
                  v-model:current-page="query.pageNow"
                  v-model:page-size="query.pageCount"
                  :page-sizes="[5, 8, 10, 20]"
                  layout="total, sizes, prev, pager, next, jumper"
                  :total="pb.totalRows"
                  @size-change="getByPage"
                  @current-change="getByPage"
                />
        </el-col>
        
      </el-row>  
      
      <!-- 编辑餐品信息的对话框  用于添加和修改 -->
      <el-dialog v-model="dialogFormVisible" title="编辑餐品信息" width="500">
          <el-form :model="form">
           
            <el-form-item label="餐品名称" :label-width="formLabelWidth">
                <el-input v-model.trim="form.foodName" autocomplete="off" />
            </el-form-item>
            <el-form-item label="餐品简介" :label-width="formLabelWidth">
                  <el-input v-model.trim="form.foodExplain" autocomplete="off" />
            </el-form-item>
            <el-form-item label="餐品价格" :label-width="formLabelWidth">
                  <el-input-number v-model="form.foodPrice" min="5"/>
            </el-form-item>
            <el-form-item label="所属商家" :label-width="formLabelWidth">
                <el-select v-model="form.businessId" 
                           placeholder="请选择商家" 
                           style="width: 240px"
                           @focus="getAllBusiness">
                    <el-option
                        v-for="business in allBusiness"
                        :key="business.businessId"
                        :label="business.businessName"
                        :value="business.businessId"
                    />
                </el-select>
            </el-form-item>
            <el-form-item label="上传图片" :label-width="formLabelWidth">
                <el-upload
                    class="avatar-uploader"
                    action="http://localhost:8080/upload"
                    :show-file-list="false"
                    :on-success="handleAvatarSuccess"
                    :before-upload="beforeAvatarUpload"
                    with-credentials="true"
                    name="myFile"
                    >
                <img v-if="imageUrl" :src="imageUrl" class="avatar" />
                <el-icon v-else class="avatar-uploader-icon"><Plus /></el-icon>
                </el-upload>
            </el-form-item>
            <el-form-item label="备注" :label-width="formLabelWidth">
                  <el-input v-model.trim="form.remarks" autocomplete="off" />
            </el-form-item>
          </el-form>
          <template #footer>
            <div class="dialog-footer">
              <el-button @click="dialogFormVisible = false">取消</el-button>
              <el-button type="primary" @click="addOrUpdate">
                确认提交
              </el-button>
            </div>
          </template>
    </el-dialog>
      
    </div>
  </template>
  
  <script setup>
  import { onMounted, ref, getCurrentInstance } from 'vue';
  import { ElMessage,ElMessageBox } from 'element-plus';
  import { Plus } from '@element-plus/icons-vue'
  
    let {proxy} = getCurrentInstance();
  
    //对话框是否显示
    let dialogFormVisible = ref(false);
    let formLabelWidth = ref('100px');


    //-------------------------------------------------------------------
    //上传图片的回显链接
    let imageUrl = ref('');
    
    //上传成功之后的回调
    const handleAvatarSuccess = (response,uploadFile)=>{
        ElMessage.success('上传成功');
        console.log('上传成功，',response,uploadFile);
        //负责上传完成 图片回显
        imageUrl.value = response.data;
        //将上传成功的链接放入form表单， 添加或修改时会携带到服务端
        form.value.foodImg = response.data;
    }
    
    //上传之前预检文件
    const beforeAvatarUpload = (rawFile)=>{
        //文件类型不符合要求 或者 文件大小超过要求  都不能上传
        if (rawFile.type !== 'image/jpeg' && rawFile.type !== 'image/png') {
            ElMessage.error('Avatar picture must be JPG format!')
            return false
            } else if (rawFile.size / 1024 / 1024 > 5) {
            ElMessage.error('Avatar picture size can not exceed 5MB!')
            return false
            }
            //可以上传
            return true
    }
    //-----------------------------------------------------------------------------

    
    //表单数据 添加和修改
    let form = ref({
        foodName: '',
        foodExplain: '',
        foodPrice: 0.0,
        businessId: 1,
        remarks: '无'
    })
    
    //点新增餐品信息按钮弹出对话框
    const showDialog = ()=>{
        dialogFormVisible.value = true;
        //数据清除
        form.value = {
            foodName: '',
            foodExplain: '',
            foodImg: '',
            foodPrice: 0.0,
            businessId: 1,
            remarks: '无',
        }
        imageUrl.value = "";
    }
  
    //分页+搜索条件
    let query = ref({
        pageNow: 1,
        pageCount: 5,
        foodName: ''
    })
    
    //分页对象 totalRows totalPages  data(集合)
    let pb = ref({
        totalRows: 0,
        totalPages: 0,
        data: []
    })
  
    const getByPage = ()=>{
        proxy.$axios({
            method: 'post',
            url: '/food/page',
            data: query.value
        }).then(res=>{
            console.log(res);
            let resultBean = res.data;
            if(resultBean.code==200){
              let pageBean = resultBean.data; 
              pb.value = pageBean;// totalRows  totalPages  data(集合)
            }else{
                ElMessage.error(resultBean.msg);
            }
        })
    }
    
    //添加或修改
    const addOrUpdate = ()=>{
        proxy.$axios({
            method: 'post',
            url: '/food',
            data: form.value
        }).then(res=>{
            let resultBean = res.data;
          if(resultBean.code == 200){
                getByPage();
                dialogFormVisible.value = false;
                ElMessage.success('保存餐品信息成功')
            }else{
                ElMessage.error(resultBean.msg);
            }
        })
    }
    
    //处理数据回显
    const handleEdit = (foodId)=>{
        console.log('回显：foodId',foodId);
        //根据id查询对应的实体数food
        proxy.$axios({
            method: 'get',
            url: '/food/'+foodId
        }).then(res=>{
            let resultBean = res.data;
            if(resultBean.code == 200){
                form.value = resultBean.data;
                dialogFormVisible.value = true;
                //图片显示回显
                imageUrl.value = resultBean.data.foodImg;
            }else{
                ElMessage.error(resultBean.msg);
            }
        })
    }
    
    //处理删除
    const handleDelete = (foodId)=>{
        console.log('删除：foodId---',foodId);
        ElMessageBox.confirm(
            '您确定要删除该餐品信息吗？',
            '删除提示',
            {
              confirmButtonText: '确定',
              cancelButtonText: '取消',
              type: 'warning',
            }
          )
            .then(() => {
                
                //确定删除
                proxy.$axios({
                    method: 'delete',
                    url: '/food/'+foodId
                }).then(res=>{
                    let resultBean = res.data;
                    if(resultBean.code == 200){
                        ElMessage.success('删除餐品信息成功');
                        getByPage();
                    }else{
                        ElMessage.error(resultBean.msg);
                    }
                })
                
            })
            .catch(() => {
                 ElMessage.info('取消删除');
            })
    }

    //所有商家信息
    const allBusiness = ref([]);

    //-----------查询所有商家 添加餐品时可以选择商家--------------------
    const getAllBusiness = ()=>{
        
        proxy.$axios({
            method: 'get',
            url: '/business/all'
        }).then(res=>{
           let resultBean = res.data;
           if(resultBean.code == 200){
            
            allBusiness.value = resultBean.data;

           }else{
             ElMessage.error(resultBean.msg);
           }
        })

    }

    //选中项的id集合
    let selectOptions = ref([]);
    
    //表格中多选框选中或取消时会触发  也就是选中项变化
    const handleSelectionChange = (newSelection)=>{
        console.log('选中项改变',newSelection);
        selectOptions.value = []; //清空
        newSelection.forEach((selOp)=>{
            console.log(selOp.foodId);
            selectOptions.value.push(selOp.foodId);
        });
    }
    
    //批量删除的函数
    const handleBatchDel = ()=>{
        console.log(selectOptions.value);
        if(selectOptions.value.length==0){
            ElMessage.info('请选中至少一条记录之后再进行删除');  
            return;
        }
        
        ElMessageBox.confirm(
            '您确定要删除选中的餐品信息吗？',
            '删除提示',
            {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning',
            }
            )
            .then(() => {

                console.log(JSON.stringify(selectOptions.value)); 

                let str = JSON.stringify(selectOptions.value); //[1,2,3]
                str = str.substring(1,str.length-1); //1,2,3
                    
                    //确定删除
                    proxy.$axios({
                        method: 'post',
                        url: '/food/batch/'+str,
                    }).then(res=>{
                        let resultBean = res.data;
                        if(resultBean.code == 200){
                            ElMessage.success('删除成功');  
                            getByPage();
                        }else{
                            ElMessage.error(resultBean.msg);
                        }
                    })
                    
                    
            })
            .catch(() => {
                ElMessage.info('取消删除');
            })
    }
    
    onMounted(()=>{
        getByPage();
        //加载之后默认查询所有商家
        getAllBusiness();
    })
  
  
  </script>
  
  <style scoped>
	.avatar-uploader .avatar {
	  width: 100px;
	  height: 100px;
	  display: block;
	}
</style>

<style>
.avatar-uploader .el-upload {
  border: 1px dashed var(--el-border-color);
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: var(--el-transition-duration-fast);
}

.avatar-uploader .el-upload:hover {
  border-color: var(--el-color-primary);
}

.el-icon.avatar-uploader-icon {
  font-size: 28px;
  color: #8c939d;
  width: 100px;
  height: 100px;
  text-align: center;
}
</style>